I got a nice email today! Thank you sir.
Greetings,
In 1963 I purchased two Zodiac watches. A Moon / Calendar for myself and a Woman's Pendant Horoscope Watch for my first wife. She has since passed it on to our daughter so it is still somewhat "in the family." I notice you have no pictures or references to this particular option so I am including some pictures to show that they do exist.
Purchase price for the Moon / Calendar was $175 and $75 for the Pendant watch; both new.
Hope this is of interest.